package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * @Description: 添加购物车
     * @Author: 锦章
     * @Date: 2024/3/9
     */
    public void add(ShoppingCartDTO shoppingCartDTO) {
        //判断当前添加的商品是否已经存在购物车，如果存在--在已存在的记录中将nnumber+1即可。
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
            //查询当前的购物车信息
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
            //判断当前查询的信息是否为空
        if(list !=null & list.size()==1){
            //如果存在商品，则在数量上加一并更新数量
            shoppingCart = list.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else{
            //如果不存在，则向数据库插入数据
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId !=null){
                //添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                //添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart.
                builder().
                userId(BaseContext.getCurrentId()).
                build());
    }

    /**
    * @Description: 清空购物车
    * @Author: 锦章
    * @Date: 2024/3/9
    */
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    /**
     * @Description: 删除购物车中的一个商品
     * @Author: 锦章
     * @Date: 2024/3/9
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size()>0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else{
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
